121636634993 has 8 divisors (see below), whose sum is σ = 122305189248. Its totient is φ = 120969642304.

The previous prime is 121636634963. The next prime is 121636635023. The reversal of 121636634993 is 399436636121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121636634963) and next prime (121636635023).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121636634993 is a prime.

It is a super-2 number, since 2×121636634993² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121636634953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234005 + ... + 545922.

It is an arithmetic number, because the mean of its divisors is an integer number (15288148656).

Almost surely, 2^121636634993 is an apocalyptic number.

It is an amenable number.

121636634993 is a deficient number, since it is larger than the sum of its proper divisors (668554255).

121636634993 is an equidigital number, since it uses as much as digits as its factorization.

121636634993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780783.

The product of its digits is 3779136, while the sum is 53.

The spelling of 121636634993 in words is "one hundred twenty-one billion, six hundred thirty-six million, six hundred thirty-four thousand, nine hundred ninety-three".